Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/723401621af1
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #12869 from dmarcos/Bug925666

Bug 925666 - [Buri][REG][Gallery]The MS always crash when save picture e...

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https://hg.mozilla.org/integration/gaia-central/rev/2db14dfb60fd
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 925666 - [Buri][REG][Gallery]The MS always crash when save picture edited